super

The keyword super refers to the superclass of the current class.

class Rectangle extends Shape {
   int width, height;
   Rectangle () {
      this(0, 0, 1, 1);  // call another constructor
   }
   Rectangle(int x, int y, int width, int height) {
      super(x, y);   // call super class constructor
                     // must be the 1st statement in the constructor
      this.width = width;
      this.height = height
   }
   . . . 
}